If the supposed consideration consists merely of a promise to do what one is already legally obligated to do, consideration is invalid.

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This is because consideration requires a legal detriment to the promisee or a legal benefit to the promisor that goes beyond existing legal obligations. A promise to perform a pre-existing duty does not constitute valid consideration because it does not involve any additional sacrifice or detriment.

If the Supposed Consideration Consists Merely of a Promise to Do